<!-- 首页主体-左侧分类 -->
<template>
    <div class='home-category' @mouseleave="categoryId = null">
        <!-- 左侧导航栏 -->
        <ul class="menu">
            <li :class="{ active: categoryId === item.id }" v-for="item in menuList" :key="item.id"
                @mouseenter="categoryId = item.id">
                <RouterLink :to="`/category/${item.id}`">{{ item.name }}</RouterLink>
                <template v-if="item.children">
                    <RouterLink v-for="sub in item.children" :key="sub.id" :to="`/category/sub/${sub.id}`">{{ sub.name
                    }}
                    </RouterLink>
                </template>
                <!-- 左侧导航栏小分类骨架屏 -->
                <span v-else>
                    <XtxSkeleton width="60px" height="18px" style="margin-right:5px" bg="rgba(255,255,255,0.2)">
                    </XtxSkeleton>
                    <XtxSkeleton width="50px" height="18px" bg="rgba(255,255,255,0.2)"></XtxSkeleton>
                </span>
            </li>
        </ul>
        <!-- 左侧导航栏弹层 -->
        <div class="layer">
            <h4 v-if="currCategory">{{ currCategory.id === 'brand' ? '品牌' : '分类' }}推荐 <small>根据您的购买或浏览记录推荐</small></h4>
            <!-- 商品 -->
            <ul v-if="currCategory && currCategory.goods && currCategory.goods.length">
                <li v-for="item in currCategory.goods" :key="item.id">
                    <RouterLink :to="`/product/${item.id}`">
                        <img :src="item.picture" alt="">
                        <div class="info">
                            <p class="name ellipsis-2">{{ item.name }}</p>
                            <p class="desc ellipsis">{{ item.desc }}</p>
                            <p class="price"><i>¥</i>{{ item.price }}</p>
                        </div>
                    </RouterLink>
                </li>
            </ul>
            <!-- 品牌 -->
            <ul v-if="currCategory && currCategory.brands && currCategory.brands.length">
                <li class="brand" v-for="item in currCategory.brands" :key="item.id">
                    <RouterLink to="/">
                        <img :src="item.picture" alt="">
                        <div class="info">
                            <p class="place"><i class="iconfont icon-dingwei"></i>{{ item.place }}</p>
                            <p class="name ellipsis">{{ item.name }}</p>
                            <p class="desc ellipsis-2">{{ item.desc }}</p>
                        </div>
                    </RouterLink>
                </li>
            </ul>
        </div>
    </div>
</template>
  
<script>
import { computed, reactive, ref } from 'vue'
import { findBrand } from '@/api/home'
import { useStore } from 'vuex'

// 获取首页头部分类的所有数据
const getMenuList = () => {
    // 后台没有平台分类 前端自定义一个
    const brand = reactive({
        id: 'brand',
        name: '品牌',
        children: [{ id: 'brand-children', name: '品牌推荐' }],
        brands: []
    })
    // 获取品牌分类下数据
    findBrand().then(data => {
        brand.brands = data.result.slice(0, 6)
    })
    // 获取其他分类的数据
    const store = useStore()
    const menuList = computed(() => {
        const list = store.state.category.list.map(item => {
            return {
                id: item.id,
                name: item.name,
                children: item.children && item.children.slice(0, 2),
                goods: item.goods
            }
        })
        // 将品牌分类数据push到总的数据menuList中
        list.push(brand)
        return list
    })

    return {
        menuList
    }
}

export default {
    name: 'HomeCategory',
    setup() {
        const { menuList } = getMenuList()
        // 展示当前分类类别下的小分类 就是对应弹窗
        const categoryId = ref(null)
        const currCategory = computed(() => {
            return menuList.value.find(item => item.id === categoryId.value)
        })

        return {
            menuList,
            categoryId,
            currCategory
        }
    }
}
</script>
  
<style scoped lang='less'>
.home-category {
    width: 250px;
    height: 500px;
    background: rgba(0, 0, 0, 0.8);
    position: relative;
    z-index: 99;

    .menu {
        li {
            padding-left: 40px;
            height: 50px;
            line-height: 50px;

            &:hover,
            &.active {
                background: @xtxColor;
            }

            a {
                margin-right: 4px;
                color: #fff;

                &:first-child {
                    font-size: 16px;
                }
            }
        }
    }

    .layer {
        width: 990px;
        height: 500px;
        background: rgba(255, 255, 255, 0.8);
        position: absolute;
        left: 250px;
        top: 0;
        display: none;
        padding: 0 15px;

        h4 {
            font-size: 20px;
            font-weight: normal;
            line-height: 80px;

            small {
                font-size: 16px;
                color: #666;
            }
        }

        ul {
            display: flex;
            flex-wrap: wrap;

            li {
                width: 310px;
                height: 120px;
                margin-right: 15px;
                margin-bottom: 15px;
                border: 1px solid #eee;
                border-radius: 4px;
                background: #fff;

                &:nth-child(3n) {
                    margin-right: 0;
                }

                a {
                    display: flex;
                    width: 100%;
                    height: 100%;
                    align-items: center;
                    padding: 10px;

                    &:hover {
                        background: #e3f9f4;
                    }

                    img {
                        width: 95px;
                        height: 95px;
                    }

                    .info {
                        padding-left: 10px;
                        line-height: 24px;
                        width: 190px;

                        .name {
                            font-size: 16px;
                            color: #666;
                        }

                        .desc {
                            color: #999;
                        }

                        .price {
                            font-size: 22px;
                            color: @priceColor;

                            i {
                                font-size: 16px;
                            }
                        }
                    }
                }
            }

            li.brand {
                height: 180px;

                a {
                    align-items: flex-start;

                    img {
                        width: 120px;
                        height: 160px;
                    }

                    .info {
                        p {
                            margin-top: 8px;
                        }

                        .place {
                            color: #999;
                        }
                    }
                }
            }
        }
    }

    &:hover {
        .layer {
            display: block;
        }
    }
}
</style>